Q: The intake manifold of an automobile engine is approximated in the figure
The intake manifold of an automobile engine is approximated in the figure as a 4-cm-ID tube, 30 cm in length. Air at a bulk temperature of 20°C enters the manifold at a flow rate of 0.01 kg/s. The man...
See AnswerQ: High-pressure water at a bulk inlet temperature of 93°
High-pressure water at a bulk inlet temperature of 93°C is flowing with a velocity of 1.5 m/s through a 0.015-m-diameter tube that is 0.3 m long. If the tube wall temperature is 204°C, determine the a...
See AnswerQ: Suppose an engineer suggests that air instead of water could flow through
Suppose an engineer suggests that air instead of water could flow through the tube in Problem 7.32 and that the velocity of the air could be increased until the heat transfer coefficient with the air...
See AnswerQ: To measure thermal conductivity, two similar 1-cm-thick
To measure thermal conductivity, two similar 1-cm-thick specimens are placed in the apparatus shown in the accompanying sketch. Electric current is supplied to the 6-cm 3 6-cm guard heater, and a watt...
See AnswerQ: As a designer working for a major electric appliance manufacturer, you
As a designer working for a major electric appliance manufacturer, you are required to estimate the amount of fiberglass insulation packing (k = 0.035 W/m K) that is needed for a kitchen oven shown in...
See AnswerQ: Air at 16°C and atmospheric pressure enters a 1.
Air at 16°C and atmospheric pressure enters a 1.25-cm-ID tube at 30 m/s. For an average wall temperature of 100°C, determine the discharge temperature of the air and the pressure drop if the pipe is (...
See AnswerQ: The equation / has been proposed by Hausen for the
The equation has been proposed by Hausen for the transition range /as well as for higher Reynolds numbers. Compare the values of Nu predicted by Hausen’s equation for Re 5 3000 and R...
See AnswerQ: Atmospheric pressure air is heated in a long annulus (25-
Atmospheric pressure air is heated in a long annulus (25-cm-ID, 38-cm-OD) by steam condensing at 149°C on the inner surface. If the velocity of the air is 6 m/s and its bulk temperature is...
See AnswerQ: If the total resistance between the steam and the air (including
If the total resistance between the steam and the air (including the pipe wall and scale on the steam side) in Problem 7.36 is 0.05 m2 K/W, calculate the temperature difference between the outer surfa...
See AnswerQ: Atmospheric air at a velocity of 61 m/s and a
Atmospheric air at a velocity of 61 m/s and a temperature of 16°C enters a 0.61-m-long square metal duct of 20-cm * 20-cm cross section. If the duct wall is at 149°C, determine the average heat transf...
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